erigon-pulse/ethdb/kv_abstract.go
2020-07-29 05:31:46 +01:00

69 lines
1.5 KiB
Go

package ethdb
import (
"context"
)
type KV interface {
View(ctx context.Context, f func(tx Tx) error) error
Update(ctx context.Context, f func(tx Tx) error) error
Close()
Begin(ctx context.Context, writable bool) (Tx, error)
IdealBatchSize() int
}
type Tx interface {
Bucket(name []byte) Bucket
Commit(ctx context.Context) error
Rollback()
}
type Bucket interface {
Get(key []byte) (val []byte, err error)
Put(key []byte, value []byte) error
Delete(key []byte) error
Cursor() Cursor
Size() (uint64, error)
Clear() error
}
type Cursor interface {
Prefix(v []byte) Cursor
MatchBits(uint) Cursor
Prefetch(v uint) Cursor
NoValues() NoValuesCursor
First() ([]byte, []byte, error)
Seek(seek []byte) ([]byte, []byte, error)
SeekTo(seek []byte) ([]byte, []byte, error)
Next() ([]byte, []byte, error)
Walk(walker func(k, v []byte) (bool, error)) error
Put(key []byte, value []byte) error
Delete(key []byte) error
Append(key []byte, value []byte) error // Danger: if provided data will not sorted (or bucket have old records which mess with new in sorting manner) - db will corrupt. Method also doesn't tolerate duplicates.
}
type NoValuesCursor interface {
First() ([]byte, uint32, error)
Seek(seek []byte) ([]byte, uint32, error)
Next() ([]byte, uint32, error)
Walk(walker func(k []byte, vSize uint32) (bool, error)) error
}
type HasStats interface {
DiskSize(context.Context) (uint64, error) // db size
}
type DbProvider uint8
const (
Bolt DbProvider = iota
Badger
Remote
Lmdb
)